I started a similar thread on the iCafe forum, in "iPhone4s" - iOS8 compatibility and suitability- you might keep an eye for replies posted there as well ..... I will follow this topic here as well ...... I'm holding off for now, as all is fine with 7.1.1 ..... David

iOS8 itself is much slower compared to 7. Safari can't keep a page in its memory at all as even switching back and forth from one app requires a reload of the page. There's also lag sometimes opening folders and opening apps is slower. The apps reloading is a real annoyance but inside the apps it doesn't run *too* slow and is fast enough, its just multitasking took a huge hit and a bit laggy. Not sure if apple will fix it.